Vulnerability-Lookup

FKIE_CVE-2026-31449

Vulnerability from fkie_nvd - Published: 2026-04-22 14:16 - Updated: 2026-06-01 17:16

Severity

7.8 (High) - CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Summary

In the Linux kernel, the following vulnerability has been resolved: ext4: validate p_idx bounds in ext4_ext_correct_indexes ext4_ext_correct_indexes() walks up the extent tree correcting index entries when the first extent in a leaf is modified. Before accessing path[k].p_idx->ei_block, there is no validation that p_idx falls within the valid range of index entries for that level. If the on-disk extent header contains a corrupted or crafted eh_entries value, p_idx can point past the end of the allocated buffer, causing a slab-out-of-bounds read. Fix this by validating path[k].p_idx against EXT_LAST_INDEX() at both access sites: before the while loop and inside it. Return -EFSCORRUPTED if the index pointer is out of range, consistent with how other bounds violations are handled in the ext4 extent tree code.

References

URL	Tags
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/01bf1e0b997d82c0e353b51ed74ef99698043c33	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/10242e640b36b91ad03d25f3dc77854bbdff8358
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/2acb5c12ebd860f30e4faf67e6cc8c44ddfe5fe8	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/407c944f217c17d4343148011acafebc604d55e1	Patch
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/4d08401aa13f1531216f1a7ae281ca4806e90a5c
416baaa9-dc9f-4396-8d5f-8c081fb06d67	https://git.kernel.org/stable/c/93f2e975ed658ce09db4d4c2877ca2c06540df83	Patch

Impacted products

Vendor	Product	Version
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	*
linux	linux_kernel	2.6.19
linux	linux_kernel	2.6.19
linux	linux_kernel	2.6.19
linux	linux_kernel	2.6.19
linux	linux_kernel	2.6.19
linux	linux_kernel	2.6.19
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0
linux	linux_kernel	7.0

JSON

To clipboard

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CVE-2026-31449 (GCVE-0-2026-31449)

Vulnerability from cvelistv5 – Published: 2026-04-22 13:53 – Updated: 2026-06-01 16:11

Title

ext4: validate p_idx bounds in ext4_ext_correct_indexes

Summary

Severity

7.8 (High)


                        
                          CVSS:3.1/AV:L/AC:L/PR:N/UI:R/S:U/C:H/I:H/A:H

Assigner

Linux

References

6 references

URL	Tags
https://git.kernel.org/stable/c/10242e640b36b91ad…
https://git.kernel.org/stable/c/4d08401aa13f15312…
https://git.kernel.org/stable/c/407c944f217c17d43…
https://git.kernel.org/stable/c/93f2e975ed658ce09…
https://git.kernel.org/stable/c/01bf1e0b997d82c0e…
https://git.kernel.org/stable/c/2acb5c12ebd860f30…

Impacted products

2 products

Vendor	Product	Version
Linux	Linux	Affected: a86c61812637c7dd0c57e29880cffd477b62f2e7 , < 10242e640b36b91ad03d25f3dc77854bbdff8358 (git) Affected: a86c61812637c7dd0c57e29880cffd477b62f2e7 , < 4d08401aa13f1531216f1a7ae281ca4806e90a5c (git) Affected: a86c61812637c7dd0c57e29880cffd477b62f2e7 , < 407c944f217c17d4343148011acafebc604d55e1 (git) Affected: a86c61812637c7dd0c57e29880cffd477b62f2e7 , < 93f2e975ed658ce09db4d4c2877ca2c06540df83 (git) Affected: a86c61812637c7dd0c57e29880cffd477b62f2e7 , < 01bf1e0b997d82c0e353b51ed74ef99698043c33 (git) Affected: a86c61812637c7dd0c57e29880cffd477b62f2e7 , < 2acb5c12ebd860f30e4faf67e6cc8c44ddfe5fe8 (git)
Linux	Linux	Affected: 2.6.19 Unaffected: 0 , < 2.6.19 (semver) Unaffected: 6.1.175 , ≤ 6.1.* (semver) Unaffected: 6.6.140 , ≤ 6.6.* (semver) Unaffected: 6.12.80 , ≤ 6.12.* (semver) Unaffected: 6.18.21 , ≤ 6.18.* (semver) Unaffected: 6.19.11 , ≤ 6.19.* (semver) Unaffected: 7.0 , ≤ * (original_commit_for_fix)

Show details on NVD website

JSON

To clipboard

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Sightings

Author	Source	Type	Date	Other

Nomenclature

Seen: The vulnerability was mentioned, discussed, or observed by the user.
Confirmed: The vulnerability has been validated from an analyst's perspective.
Published Proof of Concept: A public proof of concept is available for this vulnerability.
Exploited: The vulnerability was observed as exploited by the user who reported the sighting.
Patched: The vulnerability was observed as successfully patched by the user who reported the sighting.
Not exploited: The vulnerability was not observed as exploited by the user who reported the sighting.
Not confirmed: The user expressed doubt about the validity of the vulnerability.
Not patched: The vulnerability was not observed as successfully patched by the user who reported the sighting.

Detection rules are retrieved from Rulezet.

Action not permitted

FKIE_CVE-2026-31449

CVE-2026-31449 (GCVE-0-2026-31449)

Tags

Sightings

Nomenclature